Steel Mix

Overview
Steel Mix is an item in Survival 303 that is normally directly smelted into Steel, it's refined counterpart. When smelting this, try to do it in an area where players will not be able to steal it. It's surprising how many players are too lazy to get this themselves, so they'll usually steal it instead.

In order to get Steel Mix more easily, one may want to go to islands with both resources required to craft it. This includes:
 * Spire
 * Rockma (The easiest, as all the ore is exposed)
 * Volcano
 * Desert
 * Magma
 * Plateau
 * Cenote